Surgical buttress assemblies

ABSTRACT

A surgical buttress assembly for a surgical stapling apparatus includes a buttress and a release strap. The buttress includes a buttress body portion supporting a toe strap that extends distally from the buttress body portion. The release strap is releasably coupled to the toe strap of the buttress. The release strap is movable relative to the buttress to separate the release strap from the buttress.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No. 16/387,882, filed Apr. 18, 2019, which claims the benefit of U.S. Provisional Patent Application Ser. No. 62/815,635, filed Mar. 8, 2019, U.S. Provisional Patent Application Ser. No. 62/668,858, filed May 9, 2018, and U.S. Provisional Patent Application Ser. No. 62/668,851, filed May 9, 2018, the entire contents of each of which being hereby incorporated herein by reference.

TECHNICAL FIELD

This application relates to surgical stapling apparatus and more particularly, to surgical buttress assemblies for use with surgical stapling apparatus.

BACKGROUND

Surgical stapling apparatus are employed by surgeons to sequentially or simultaneously apply one or more rows of fasteners, e.g., staples or two-part fasteners, to body tissue for the purpose of joining segments of body tissue together. Such apparatus generally include a pair of jaws or finger-like structures between which the body tissue to be joined is placed. When the surgical stapling apparatus is actuated, or “fired,” staple drive members in one of the jaws push the surgical staples through the body tissue and into an anvil in the opposite jaw which forms the staples. If body tissue is to be removed or separated, a knife blade can be provided in one of the jaws of the apparatus to cut the body tissue between the lines of staples.

Surgical supports, e.g., meshes or buttress materials, may be used in combination with surgical stapling apparatus to bridge, repair, and/or reinforce tissue defects within a patient such as those occurring, for example, in the abdominal wall, chest wall, diaphragm, or musculo-aponeurotic areas of the body. The buttress material reinforces the staple line as well as covers the juncture of the tissues to reduce leakage prior to healing. The buttress material can help promote proper staple formation while reducing twisting/malformation caused by any misalignment of tissue and/or unusual or non-uniform tissue. The buttress material can also provide support to weakened tissue, or help address differences in the thickness of tissues.

Accordingly, buttress materials provide clinical benefits. Nonetheless, improvements are desired, for example, to reduce the complexity of manufacture and/or application of the buttress materials onto surgical stapling apparatus or into tissue, or to expand the range of application for use of the buttress materials.

SUMMARY

In an aspect of this disclosure, a surgical buttress loading assembly for use with a surgical stapling apparatus includes a surgical buttress and a surgical buttress applicator. The surgical buttress includes a tubular body and an elongate member extending from the tubular body. The surgical buttress applicator includes a base and a handle releasably engaged with the base. The elongate member is disposed within and extends through the handle, and the tubular body of the surgical buttress is positioned within a cavity of the base.

The base of the surgical buttress applicator may include an elongate body having a proximal end defining an opening into the cavity, and a closed distal end. In embodiments, a tab extends proximally from the proximal end of the elongate body of the base and between the handle and the cavity of the base, and is positioned through an aperture defined in the elongate member of the surgical buttress. In some embodiments, a tab extends proximally from the proximal end of the elongate body of the base, and is positioned through an aperture defined in the tubular body of the surgical buttress.

The base of the surgical buttress applicator may include a fin having a concave wall defining an arcuate cut-out configured to receive the handle therein. The handle of the surgical buttress applicator may include an outer wall defining a groove therein that is configured to receive the concave wall of the base therein to releasably retain the handle within the arcuate cut-out of the base.

The handle of the surgical buttress application may include an outer handle housing including an outer wall and an inner wall defining an annular cavity therebetween. The elongate member of the surgical buttress may be disposed within the annular cavity of the outer handle housing. In embodiments, the outer wall of the outer handle housing includes a slot defined therethrough that is in fluid communication with the annular cavity, and the elongate member of the surgical buttress extends through the slot.

In embodiments, the handle of the surgical buttress application includes an inner handle housing rotatably disposed within the annular cavity of the outer handle housing, and the elongate member of the surgical buttress is wrapped around the inner handle housing. In some embodiments, the inner wall of the outer handle housing includes flexible wall segments extending radially around a central opening defined in the outer handle housing. At least one of the flexible wall segments may include a lip extending therefrom to aid in retaining the inner handle housing within the annular cavity of the outer handle housing. In some embodiments, the inner handle housing includes an annular base including an inner surface configured to engage and be rotatably mounted on the inner wall of the outer handle housing. The inner handle housing may include annular flanges extending from opposed sides of the annular base to aid in retaining the elongate member of the surgical buttress on an outer surface of the annular base.

In another aspect of this disclosure, a surgical stapling system includes a surgical stapling apparatus and a surgical buttress loading assembly. The surgical stapling apparatus includes a handle assembly, an elongate tubular body portion extending distally from the handle assembly, and an end effector extending distally from the elongate tubular body portion. The end effector includes an anvil assembly and a staple cartridge assembly. The surgical buttress loading assembly includes a surgical buttress and a surgical buttress applicator. The surgical buttress includes a tubular body and an elongate member extending from the tubular body. The surgical buttress applicator includes a base and a handle releasably engaged with the base. The elongate member is disposed within and extends through the handle, and the tubular body of the surgical buttress is positioned within a cavity of the base. The cavity of the base is sized and shaped to slidably receive at least one of the anvil assembly or the staple cartridge assembly of the surgical stapling apparatus therein.

In embodiments, the tubular body of the surgical buttress includes a buttress portion and a folded portion, and the base of the surgical buttress applicator includes a first wall portion configured to extend over a tissue facing surface of the anvil or the staple cartridge assembly and a second wall portion configured to extend around the anvil or the staple cartridge assembly and over an outwardly facing surface of the anvil or staple cartridge assembly. The buttress portion of the surgical buttress is positioned adjacent to the first wall portion and the folded portion is positioned adjacent to the second wall portion such that the tubular body of the surgical buttress is open to receive the anvil or staple cartridge assembly therein.

The handle of the surgical buttress applicator may include a pair of fingers extending from an outer wall thereof that are configured to releasably engage the elongate tubular body portion of the surgical stapling apparatus.

In yet another aspect of this disclosure, a method of using a surgical buttress loading assembly with a surgical stapling apparatus includes: sliding a surgical buttress loading assembly onto an anvil assembly or a staple cartridge assembly of a surgical stapling apparatus to dispose the anvil or staple cartridge assembly within a tubular body of the surgical buttress, the surgical buttress loading assembly including: a surgical buttress including a tubular body and an elongate member extending from the tubular body; and a surgical buttress applicator including a base and a handle releasably engaged with the base, the elongate member disposed within and extending through the handle, and the tubular body of the surgical buttress positioned within a cavity of the base.

The method may further include detaching the handle of the surgical buttress applicator from the base; and sliding the base of the surgical buttress applicator off of the anvil or staple cartridge assembly, leaving the tubular body of the surgical buttress disposed over the anvil or staple cartridge assembly.

In embodiments, the method further includes attaching the handle of the surgical buttress applicator to the elongate tubular body portion of the surgical stapling apparatus. In some embodiments, the method further includes: firing the surgical stapling apparatus to drive fasteners through a buttress portion of the tubular body of the surgical buttress; and pulling the handle of the surgical buttress applicator away from the buttress portion to separate the elongate member and a folded portion of the tubular body of the surgical buttress from the buttress portion.

According to another aspect of the disclosure, a surgical buttress assembly for a surgical stapling apparatus includes a buttress and a release strap. The buttress includes a buttress body portion that supports a toe strap. The toe strap extends distally from the buttress body portion. The release strap is releasably coupled to the toe strap of the buttress. The release strap is movable relative to the buttress to separate the release strap from the buttress.

In embodiments, the release strap may include detents configured to couple to the buttress to secure the release strap to the buttress. The buttress may define detent slots that are configured to receive the detents of the release strap. The buttress body may include a first side flap on a first side of the buttress body portion and a second side flap on a second side of the buttress body portion. The first and second side flaps may be configured to fold over an anvil assembly of the surgical stapling apparatus to support the buttress body on the anvil assembly. The first and second side flaps may define the detents slots. The detent slots may be positioned in longitudinally spaced-apart locations along the first and second side flaps.

In various embodiments, the release strap may include a finger assembly that extends distally from the release strap. The finger assembly may be configured to couple to the toe strap. The finger assembly may include a first digit and a second digit. The first digit may be receivable within one of the detent slots of the buttress. The second digit may be configured to be secured to the toe strap.

In some embodiments, the first and second side flaps may include distal tabs that define retention slots and the toe strap may define retention slots that are positioned to align with the retention slots of the distal tabs when the distal tabs and the toe strap are folded together over the anvil assembly.

In embodiments, the second digit of the finger assembly may be looped through the retentions slots of the distal tabs and the toe strap to secure the release strap to the buttress. The second digit may include a distal tongue having a gradually thickened width.

In various embodiments, the toe strap of the buttress may include a plurality of wings.

According to yet another aspect, this disclosure is directed to an end effector for a surgical stapling apparatus. The end effector includes a cartridge assembly and an anvil movably coupled to the cartridge assembly. The end effector supports a surgical buttress assembly. The surgical buttress assembly includes a buttress and a release strap. The buttress includes a buttress body portion supporting a toe strap that extends distally from the buttress body portion. The release strap is releasably coupled to the toe strap of the buttress. The release strap is movable relative to the buttress to separate the release strap from the buttress.

According to still another aspect, this disclosure is directed to a surgical stapling apparatus including a housing and an elongate tubular body portion extending from the housing and supporting an end effector. The end effector includes a cartridge assembly and an anvil. The cartridge assembly supports fasteners. The anvil is configured to form the fasteners of the cartridge assembly and supports a surgical buttress assembly. The surgical buttress assembly includes a buttress and a release strap. The buttress includes a buttress body portion supporting a toe strap that extends distally from the buttress body portion. The release strap is releasably coupled to the toe strap of the buttress. The release strap is movable relative to the buttress to separate the release strap from the buttress.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other aspects, features, and advantages of this disclosure will be apparent in light of the following detailed description when taken in conjunction with the accompanying drawings, which are incorporated in and constitute a part of this specification, wherein:

FIG. 1 is a perspective view of a surgical stapling apparatus having a surgical buttress disposed thereon in accordance with an embodiment of this disclosure;

FIG. 2 is an exploded, perspective view of anvil and staple cartridge assemblies of an end effector of the surgical stapling apparatus of FIG. 1 ;

FIG. 2A is a bottom, perspective view of a distal portion of an exemplary anvil of the anvil assembly of FIG. 2 ;

FIG. 3 is a perspective view of an end effector of the surgical stapling apparatus of FIG. 1 , showing the surgical buttress disposed thereon;

FIG. 4 is a side view of the surgical buttress of FIG. 1 , separated from the surgical stapling apparatus;

FIG. 5 is a plan view of the surgical buttress of FIG. 4 , in an unfolded condition in accordance with an embodiment of this disclosure;

FIG. 6 is a side, perspective view of a surgical buttress loading assembly including a surgical buttress applicator and a surgical buttress in a loaded configuration in accordance with an embodiment of this disclosure;

FIG. 7 is an end, perspective view of a base of the surgical buttress applicator of FIG. 6 ;

FIG. 8 is a perspective view, with parts separated, of the surgical buttress loading assembly of FIG. 6 ;

FIG. 9 is a side view of a surgical loading unit of the surgical stapling apparatus of FIG. 1 including the surgical buttress loading assembly of FIG. 6 disposed thereon;

FIG. 10 is a side view of a surgical stapling apparatus including the surgical buttress loading assembly of FIG. 9 , illustrating a handle of the surgical buttress applicator separated from a base of the surgical buttress applicator;

FIG. 11 is a perspective view of anvil and cartridge buttresses in accordance with another embodiment of this disclosure;

FIG. 12 is a cross-sectional view of the anvil buttress of FIG. 11 ;

FIG. 13 is a perspective view of an end effector of a surgical loading unit having the anvil and cartridge buttresses of FIG. 11 disposed thereon in accordance with an embodiment of this disclosure;

FIG. 14 is a bottom, perspective view of a surgical loading unit supporting one embodiment of a surgical buttress assembly in accordance with the principles of this disclosure;

FIG. 15 is a top, perspective view of the surgical buttress assembly of FIG. 14 as supported on the surgical loading unit of FIG. 14 ;

FIG. 16 is an enlarged view of the indicated area of detail shown in FIG. 15 ;

FIG. 17 is a perspective view, with parts separated, of the surgical buttress assembly of FIGS. 14 and 15 in relation to an anvil assembly of an end effector of the surgical loading unit of FIGS. 14 and 15 ;

FIG. 18 is a top view of a buttress of the surgical buttress assembly of FIGS. 14 and 15 , the buttress disposed in an unfolded position or configuration;

FIG. 19 is a perspective view of the buttress of FIG. 18 in a folded position or configuration;

FIG. 20 is a top view of a release strap of the surgical buttress assembly of FIGS. 14 and 15 ;

FIG. 21 is a perspective view of the release strap of FIG. 20 ;

FIG. 22 is an enlarged, perspective view of a distal portion of the anvil assembly of FIG. 17 with the buttress of FIGS. 18 and 19 disposed on the anvil assembly in a partially folded position or configuration about the anvil assembly;

FIG. 23 is an enlarged, perspective view of the distal portion of the anvil assembly of FIG. 22 with the buttress disposed on the anvil assembly in the folded position or configuration, and with a distal portion of the release strap positioned for attachment to the buttress;

FIG. 24 is an enlarged, cross-sectional view taken along section line 24-24 shown in FIG. 16 ;

FIG. 25 is a perspective view illustrating the surgical buttress assembly of FIG. 14 being separated from the anvil assembly;

FIG. 26 is an enlarged, cross-sectional view taken along section line 26-26 shown in FIG. 25 ;

FIG. 27 is a perspective view illustrating another embodiment of a surgical buttress assembly supported on the anvil assembly in accordance with the principles of this disclosure;

FIG. 28 is an enlarged, perspective view of the indicated area of detail shown in FIG. 27 ;

FIG. 29 is a perspective view, with parts separated, showing a release strap of the surgical buttress assembly of FIG. 27 separated from a buttress of the surgical buttress assembly, the buttress supported on the anvil assembly;

FIG. 30 is a top view of the buttress of FIG. 29 , the buttress shown in an unfolded position or configuration;

FIG. 31 is a perspective view of the buttress of FIG. 29 , the buttress in a partially folded position or configuration;

FIG. 32 is a perspective view of the buttress of FIG. 29 , the buttress in another partially folded position or configuration;

FIG. 33 is perspective view of the buttress of FIG. 29 , the buttress in a folded position or configuration;

FIG. 34 is a perspective view illustrating yet another embodiment of a surgical buttress assembly supported on the anvil assembly in accordance with the principles of this disclosure;

FIG. 35 is an enlarged, perspective view of the indicated area of detail shown in FIG. 34 ;

FIG. 36 is a perspective view illustrating a release strap of the surgical buttress assembly of FIG. 34 separated from a buttress of the surgical buttress assembly, the buttress supported on the anvil assembly;

FIG. 37 is a top view of the release strap of FIG. 36 ;

FIG. 38 is a top view of the buttress of FIG. 36 in an unfolded position or configuration;

FIG. 39 is a perspective view illustrating the surgical buttress assembly of FIG. 34 being separated from the anvil assembly;

FIG. 40 is a perspective view illustrating still another embodiment of a surgical buttress assembly supported on the anvil assembly in accordance with the principles of this disclosure;

FIG. 41 is a perspective view illustrating a release strap of the surgical buttress assembly of FIG. 40 being separated from a buttress of the surgical buttress assembly, the buttress supported on the anvil assembly in a folded position or configuration; and

FIG. 42 is a top view of the buttress of FIG. 41 in an unfolded position or configuration.

DETAILED DESCRIPTION

Embodiments of this disclosure will now be described in detail with reference to the drawing figures wherein like reference numerals identify similar or identical elements. Throughout this description, the term “proximal” refers to a portion of a structure, or component thereof, that is closer to a user, and the term “distal” refers to a portion of the structure, or component thereof, that is farther from the user. Directional reference terms, such as “top,” “bottom,” “side,” and the like, are used to ease description of the embodiments and are not intended to have any limiting effect on the ultimate orientation of a structure or any part thereof. In the following description, well-known functions or constructions are not described in detail to avoid obscuring this disclosure in unnecessary detail.

Referring now to FIG. 1 , an exemplary surgical stapling apparatus or surgical stapler 1 is shown for use in stapling tissue and applying one or more buttress materials or surgical buttresses to the tissue. The surgical stapling apparatus 1 generally includes a handle assembly 10 and an elongate tubular body portion 20 that extends distally from the handle assembly 10. The elongate tubular body portion 20 may include a surgical loading unit 22 that is selectively attachable to the elongate tubular body portion 20. An end effector or jaw assembly 30 extends distally from the elongate tubular body portion 20 (e.g., a distal end portion of the surgical loading unit 22). The jaw assembly 30 includes an anvil assembly 40 and a staple cartridge assembly 50. The jaw assembly 30 may be permanently affixed to the elongate tubular body portion 20 or may be detachable with respect to the elongate tubular body portion 20 and thus, replaceable with a new jaw assembly 30. The anvil assembly 40 and/or the staple cartridge assembly 50 is pivotable with respect to the elongate tubular body portion 20 such that the anvil and/or staple cartridge assemblies 40, 50 is movable between an open position in which the anvil and staple cartridge assemblies 40, 50 are spaced apart with respect to each other and a closed position in which the anvil and staple cartridge assemblies 40, 50 are substantially adjacent each other.

The handle assembly 10 of the surgical stapling apparatus 1 includes a stationary handle member 12 a, a movable handle member 12 b, and a barrel portion 14. An articulation lever 16 is mounted on the forward end of the barrel portion 14 to facilitate articulation of the jaw assembly 30. A rotatable member 18 is also mounted on the forward end of the barrel portion 14, adjacent the articulation lever 16. Rotation of the rotatable member 18 relative to the barrel portion 14 rotates the elongate tubular body portion 20 and the jaw assembly 30 relative to the handle assembly 10 so as to properly orient the anvil and staple cartridge assemblies 40, 50 relative to tissue to be stapled. A knob 19 is movably positionable along the barrel portion 14. The knob 19 is advanced distally to approximate or close the anvil and staple cartridge assemblies 40, 50, relative to each other, and retracted proximally to unapproximate or open the anvil and staple cartridge assemblies 40, 50, with respect to each other. Actuation of the movable handle member 12 b applies lines of staples 58 (FIG. 2 ) to tissue captured between the anvil and staple cartridge assemblies 40, 50.

As shown in FIG. 2 , the anvil assembly 40 of the jaw assembly 30 includes an anvil plate 42 having a central longitudinal slot 41 formed therein, and a cover plate 44 secured over the anvil plate 42 such that the cover plate 44 defines a top or outwardly facing surface 46 of the anvil assembly 40. As seen in FIG. 2A, the anvil plate 42 may include a plurality of staple forming pockets/cavities 45 defined in an inwardly or tissue facing surface 48 thereof.

The staple cartridge assembly 50 of the jaw assembly 30 includes a cartridge carrier 52 defining an elongated support channel 51 configured to selectively receive a staple cartridge 54 therein. The cartridge carrier 52 also defines a bottom or outwardly facing surface 53 of the staple cartridge assembly 50. The staple cartridge 54 is removable and replaceable in the cartridge carrier 52 of the staple cartridge assembly 50. The staple cartridge 54 includes an inwardly or tissue facing surface 56 defining staple pockets or retention slots 55 formed therein for receiving a plurality of fasteners or staples 58 and staple pushers 60. A central longitudinal slot 57 is formed in and extends along a substantial length of the staple cartridge 54 to facilitate passage of a knife blade 62 of a drive bar 64 therethrough. During operation of the surgical stapler 1, an actuation sled 66 translates through the staple cartridge 54 to advance cam wedges 68 of the actuation sled 66 into sequential contact with the staple pushers 60, to cause the staple pushers 60 to translate vertically within the staple pockets 55 and urge the staples 58 from the staple pockets 55 towards the tissue facing surface 48 of the anvil plate 42 of the anvil assembly 40.

For a detailed description of the structure and function of exemplary surgical stapling apparatus, reference may be made to U.S. Pat. Nos. 8,256,656, 7,819,896, and 7,128,253, the entire content of each of which is incorporated herein by reference. It should be appreciated that principles of this disclosure are equally applicable to surgical stapling apparatus having other configurations such as, for example, the types described in U.S. Pat. Nos. 7,334,717, 5,964,394, and 5,915,616, the entire content of each of which is incorporated herein by reference. Accordingly, it should be understood that a variety of surgical stapling apparatus may be utilized with the surgical buttresses and/or surgical buttress applicators of this disclosure such as, for example, laparoscopic staplers, open staplers, transverse anastomosis staplers, and end-to-end anastomosis staplers having a circular staple cartridge and anvil, as well as staple cartridge assemblies housing surgical fasteners other than staples.

With reference again to FIG. 1 , a surgical buttress assembly 100 is shown releasably coupled to the anvil assembly 40 of the surgical stapler 1.

As shown in FIGS. 3 and 4 , the surgical buttress assembly 100 of the surgical stapler 1 includes an elongate member or release strap 102, a folded portion 104, and a buttress portion 106. The release strap 102 is coupled to the folded portion 104, and the folded portion 104 is coupled to the buttress portion 106 and is separable therefrom by perforations 108. Together, the folded portion 104 and the buttress portion 106 form a tubular body 110 that is sized and shaped to facilitate the reception of the anvil assembly 40 and/or the staple cartridge assembly 50 therethrough.

The release strap 102 of the surgical buttress assembly 100 is secured to the folded portion 104 of the surgical buttress assembly 100 and extends proximally therefrom. The release strap 102 is of a sufficient length to be accessible outside of a patient's body and may extend the length of the elongate tubular body portion 20 of the surgical stapler 1. The release strap 102 may be a band, a cord, a rope, a strap, a suture, among other elongate structures tethered to or integrally formed with the folded portion 104 of the surgical buttress assembly 100. In some embodiments, the release strap 102 may include two or more elongate sections such as, for example, a suture attached to a strip of material that extends proximally from the folded portion 104 of the surgical buttress assembly 100.

When the release strap 102 is pulled away from the tubular body 110 (e.g., proximally towards a user), the folded portion 104 and the release strap 102 separate from the buttress portion 106 along the perforations 108. It should be understood, however, that the perforations 108 may be omitted from the surgical buttress assembly 100. For example, the juncture between the folded portion 104 and the buttress portion 106 may be formed or otherwise secured to one another to facilitate separation of the folded portion 104 from the buttress portion 106 upon application of a force to the release strap 102.

The folded portion 104 of the surgical buttress assembly 100 can include one or more sections of material, and can be made from the same material as the buttress portion 106, or from a different material, as discussed above. The folded portion 104 can be secured to itself to form the tubular body 110 and/or the buttress portion 106 can be attached to the folded portion 104 or itself. The folded portion 104 and/or the buttress portion 106, or sections thereof, may be integrally formed or secured together via any suitable attachment features within the purview of those skilled in the art, such as, mechanical attachment features (e.g., sutures, pins), chemical attachment features (e.g., adhesives), and/or attachment methods (e.g., welding).

The folded portion 104 can include first and second sections 112, 114 secured to one another. In embodiments, the first and second sections 112, 114 are welded to each other. The release strap 102 can be unitary with the folded portion 104 and/or may be permanently secured to the folded portion 104. As seen in FIG. 4 , the release strap 102 can be integrally formed with the first section 112 of the folded portion 104 and attached to the second section 114 by welding at an attachment region 113. The release strap 102 can include one or more elongate sections, as discussed above, and can be made from the same material, or different material, as the folded and/or buttress portions 104, 106.

With continued reference to FIG. 3 , the surgical buttress assembly 100 of the surgical stapler 1 is disposed on the anvil assembly 40 of the stapler 1 with the buttress portion 106 positioned over the tissue facing surface 48 of the anvil assembly 40, the folded portion 104 positioned over the outwardly facing surface 46 of the anvil assembly 40, and the release strap 102 extending proximally along the elongate tubular body portion 20 of the surgical stapler 1. The perforations 108 are positioned adjacent side surfaces 49 of the anvil assembly 40 that interconnect the outwardly and tissue facing surfaces 46, 48 of the anvil assembly 40.

The perforations 108 of the surgical buttress assembly 100 can be any size and shape, such as small pin-holes or larger openings such as, for example, the elongated openings shown in FIG. 3 , or the perforations 108 can be a single feature, such as a line of weakness in the buttress material or materials forming the folded and buttress portions 104, 106. The perforations 108 may be formed using laser cutting, knife cutting, press cutting, scoring, and etching, among other methods within the purview of those skilled in the art. In some embodiments, the surgical buttress assembly 100 is formed from a non-woven polyglycolide material that is laser cut to form the perforations 108.

As shown in FIG. 5 , the entire surgical buttress assembly 100 of the surgical stapler 1 may be formed from a single sheet of material 120. The surgical buttress assembly 100 is cut from the single sheet of material 120 and the perforations 108 are formed therein. The single sheet of material 120 is cut such that the surgical buttress assembly 100 includes the release strap 102, the folded portion 104 including first and second sections 112, 114, and the buttress portion 106. The first and second sections 112, 114 of the folded portion 104 can be folded and attached to one another before the surgical buttress assembly 100 is disposed on or around the anvil assembly 40 of the surgical stapler 1 (e.g., prior to loading the surgical buttress assembly 100 into a surgical buttress applicator 200 (FIG. 6 )), or as the surgical buttress assembly 100 is applied to the anvil assembly 40. As discussed above, the first and second sections 112, 114 of the folded portion 104 can be attached to one other by, for example, welding, using adhesives, tying sutures, etc.

Turning now to FIG. 6 , a surgical buttress loading assembly 201 is shown. The surgical buttress loading assembly 201 includes a surgical buttress applicator 200 configured for positioning the surgical buttress assembly 100 onto a surgical stapler 1 (FIG. 1 ) and/or removing the release strap 102 and the folded portion 104 (FIG. 1 ) of the surgical buttress assembly 100 from a surgical site. The surgical buttress applicator 200 includes a base 210 sized and shaped to releasably retain the tubular body 110 (FIG. 3 ) of the surgical buttress assembly 100 therein, and a handle 220 configured to retain the release strap 102 of the surgical buttress assembly 100 therein.

As shown in FIGS. 7 and 8 , the base 210 of the surgical buttress applicator 200 includes an elongate body 212 having a proximal end 212 a and a distal end 212 b, and defines a cavity 213 therein. The cavity 213 is sized and shaped to slidably receive at least one of the anvil or staple cartridge assembly 40, 50 (FIG. 1 ) of the surgical stapler 1 therein. The elongate body 212 includes a first or substantially flat wall section 214 a corresponding to the tissue facing surface 48, 56 (FIG. 2 ) of the anvil or staple cartridge assembly 40, 50 of the surgical stapler 1, and a second or rounded wall section 214 b configured to extend around the anvil or staple cartridge assembly 40, 50 and over the outwardly facing surface 46, 53 (FIG. 2 ) of the anvil or staple cartridge assembly 40, 50.

The proximal end 212 a of the elongate body 212 defines an opening into the cavity 213 of the base 210, and the distal end 212 b is closed by a distal wall section 214 c. It is envisioned, however, that the distal end 212 b of the elongate body 212 may be open. The proximal end 212 a further includes first and second tabs 216 a, 216 b extending proximally and axially from the respective first and second wall sections 214 a, 214 b of the elongate body 212 in opposed relation relative to each other. The first and second tabs 216 a, 216 b are configured to engage the surgical buttress assembly 100.

The base 210 of the surgical buttress applicator 200 further includes a fin 218. The fin 218 extends from the second wall section 214 b of the elongate body 212. The fin 218 includes a concave wall 218 a defining an arcuate cut-out 219 configured to receive the handle 220 therein.

With reference now to FIGS. 6 and 8 , the handle 220 of the surgical buttress applicator 200 includes an outer handle housing 230 and an inner handle housing 240 rotatably disposed within the outer handle housing 230. The release strap 102 of the surgical buttress assembly 100 is spooled, wound or rolled around the inner handle housing 240 and extends through a slot 237 defined through the outer handle housing 230 such that the tubular body 110 of the surgical buttress assembly 100 is positionable within the cavity 213 of the base 210.

The outer handle housing 230 of the handle 220 includes an outer wall 232 and an inner wall 234 defining an annular cavity 233 therebetween. The outer wall 232 includes a groove 235 defined therein that corresponds with, and is configured to frictionally engage, the concave wall 218 a of the fin 218 of the base 210 to releasably retain the handle 220 within the arcuate cut-out 219 of the base 210. The outer handle housing 230 further includes a pair of fingers 236 extending from the outer wall 232 that are configured to releasably engage the elongate tubular body portion 20 (FIG. 1 ) of the surgical stapler 1, and a slot 237 defined through the outer wall 232 that is sized and shaped for passage of the release strap 102 of the surgical buttress assembly 100 therethrough.

The inner wall 234 of the outer handle housing 230 includes flexible wall segments 238 extending radially around a central opening 239 defined in the outer handle housing 230. The flexible wall segments 238 are movable to allow a user to insert or remove the inner handle housing 240 into or out of the annular cavity 233 of the outer housing 230. At least one of the flexible wall segments 238 includes a lip 238 a extending towards the outer wall 232 to help retain the inner handle housing 240 within the annular cavity 233. In embodiments, at least two flexible wall segments 238 (e.g., opposed flexible wall segments 238) may each include a lip 238 a extending therefrom and, in some embodiments, alternating flexible wall segments 238 may each include a lip 238 a extending therefrom.

The inner handle housing 240 of the handle 220 is concentric with and configured to be received within the annular cavity 233 of the outer handle housing 230. The inner handle housing 240 includes an annular base 242 having an inner surface 242 a configured to engage the inner wall 234 of the outer handle housing 230 and to be rotatably mounted thereon. The arcuate base 242 also includes an outer surface 242 b that is configured to receive the release strap 102 of the surgical buttress assembly 100 therearound. Annular flanges 244 a, 244 b extend from opposed sides of the annular base 242 adjacent respective sides of the release strap 102 when the release strap 102 is wrapped around the annular base 242.

In a method of assembling the handle 220, the release strap 102 of the surgical buttress assembly 100 is wrapped around the outer surface 242 b of the annular base 242 of the inner handle housing 240 such that the release strap 102 conforms to the contour of the annular base 242. The release strap 102 is wound around the annular base 242 such that a majority of the release strap 102 is wound around the inner handle housing 240, and the tubular body 110 of the surgical buttress assembly 100 freely extends therefrom. In embodiments, a terminal end of the release strap 102 may be secured to the inner handle housing 240 and/or to itself (e.g., the terminal end may form a closed loop 107 a (FIG. 13 ) around the inner handle housing) to secure the release strap 102 to the inner handle housing 240. The tubular body 110 is passed through the slot 237 of the outer handle housing 230 and pulled therethrough, and the inner handle housing 240 is inserted into the annular cavity 233 of the outer handle housing 230.

In a method of assembling the surgical buttress loading assembly 201, the assembled handle 220 is positioned within the arcuate cut-out 219 of the base 210 of the surgical buttress applicator 200, and the tubular body 110 of the surgical buttress assembly 100, which includes the folded and buttress portions 104, 106 of the surgical buttress assembly 100, is positioned within the cavity 213 of the base 210 of the surgical buttress applicator 200. The folded portion 104 of the surgical buttress assembly 100 is positioned adjacent to the second wall section 214 b of the base 210 and the buttress portion 106 is disposed adjacent to the first wall section 214 a of the base 210 such that the tubular body 110 is open to receive the anvil or staple cartridge assembly 40, 50 therein.

The inner handle member 240 may then be rotated relative to the outer handle member 230 to wind or unwind the release strap 102 around the inner handle member 240 so that the release strap 102 is made taut as shown in FIG. 6 . In the loaded configuration shown in FIG. 6 , the portion of the release strap 102 extending between the base 210 and the handle 220 of the surgical buttress applicator 200 is secured to the second tab 216 b of the base 210 to help retain the tubular body 110 of the surgical buttress assembly 100 within the base 210. The second tab 216 b is positioned through an aperture 103 defined through the release strap 102. The aperture 103 may be formed during assembly of the surgical buttress assembly 100 into the surgical buttress applicator 200, or the aperture 103 may be pre-formed in the surgical buttress assembly 100 prior to assembly. In some embodiments, the first tab 216 a of the base 210 of the surgical buttress applicator 200 may be engaged with an aperture 105 (FIG. 13 ) defined in the buttress portion 106 of the surgical buttress assembly 100 to further help retain the tubular body 110 within the base 210 in an open configuration for receiving the anvil or staple cartridge assembly 40, 50 therein.

In a method of loading the surgical buttress assembly 100 onto the surgical stapler 1, as shown in FIG. 9 , the surgical buttress loading assembly 201 is applied to the anvil assembly 40 of the surgical stapler 1. A user grasps the handle 220 of the surgical buttress applicator 200 and manipulates the surgical buttress loading assembly 201 onto the anvil assembly 40 by aligning the cavity 213 (FIG. 7 ) of the base 210 with the distal end of the anvil assembly 40 and sliding the surgical buttress applicator 200 proximally over the anvil assembly 40 until the anvil assembly 40 abuts the distal wall section 214 c (FIG. 7 ) of the base 210. As discussed above, the shape (e.g., a transverse cross-sectional shape/profile) of the cavity 213 of the base 210 corresponds to the shape (e.g., a transverse cross-sectional shape/profile) of the anvil assembly 40 (or the staple cartridge assembly 50) for ease of application of the surgical buttress assembly 100 thereon.

With the surgical buttress loading assembly 201 applied onto the anvil assembly 40 such that the anvil assembly 40 is received within the tubular body 110 of the surgical buttress assembly 100 as well as within the base 210 of the surgical buttress applicator 200, the handle 220 of the surgical buttress applicator 200 is detached from the base 210 and pulled proximally towards the user, thereby unrolling the release strap 102 from within the handle 220 of the surgical buttress applicator 200, as shown in FIG. 10 . The handle 220 is secured to the elongate tubular body portion 20 of the surgical stapler 1 via the pair of fingers 236 of the outer handle housing 230 at a position proximal of the end effector 30, such as adjacent to the handle assembly 10 (FIG. 1 ) of the surgical stapler 1, and/or at least at a location outside of a patient's body during a surgical procedure. The user can then grasp the base 210 of the surgical buttress applicator 200 and slide it distally off of the anvil assembly 40. The base 210 may be removed from the anvil assembly 40 either prior to, or after, attaching the handle 220 to the surgical stapler 1. As the base 210 is slid distally, the surgical buttress assembly 100 disengages from the second tab 216 b of the base 210 such that the surgical buttress assembly 100 is left loaded on the anvil assembly 40. The surgical stapler 1 is now ready for use.

In a method of use, the loaded surgical stapler 1 is introduced to a surgical site through a trocar or other access device. The surgical stapler 1 is operated within methods known by those skilled in the art. Once the anvil and staple cartridge assemblies 40, 50 are clamped onto tissue, the surgical stapler 1 is fired. In firing the surgical stapler 1, the drive bar 64 (FIG. 2 ) is advanced distally through the jaw assembly 30 urging the staple pushers 60 upwardly which, in turn, drive the staples 58 out of the staple pockets 55 and through the buttress portion 106 of the surgical buttress assembly 100 as well as the captured tissue, thereby stapling the buttress portion 106 to the tissue. During firing, the knife blade 62 of the drive bar 64 travels distally while substantially simultaneously cutting and dividing the tissue as well as the buttress portion 106 of the surgical buttress assembly 100 disposed between the rows of now formed staples 58.

The folded portion 104 and the release strap 102 of the surgical buttress assembly 100 can then be detached from the now-stapled buttress portion 106 by pulling the handle 220 proximally to tear the folded portion 104 from the buttress portion 106 via the perforations 108. The handle 220 may be pulled separately from the surgical stapler 1 by detaching the handle 220 from the elongate tubular body portion 20 of the surgical stapler 1, or the handle 220 may be pulled when the surgical stapler 1 is pulled proximally away from the surgical site. Alternatively, the user may grasp an exposed portion of the release strap 102 and pull the release strap 102 directly.

It should be understood that additionally or alternatively, a surgical buttress loading assembly may be applied to the staple cartridge assembly of the surgical stapler and/or either the anvil assembly or the staple cartridge assembly can include a buttress material pre-loaded thereon. For example, in surgical stapling apparatus having staple cartridge assemblies that are removable and replaceable, the staple cartridge assembly may have a buttress pre-loaded onto it by the manufacturer. In these circumstances, the user can utilized a surgical buttress loading assembly that is ready for installation on the anvil assembly, as discussed above. In embodiments, the surgical stapling apparatus can be re-used on the same patient by reloading it with a staple cartridge assembly having a fresh set of staples ready to be fired and a fresh buttress material. A new surgical buttress loading assembly may be applied to the anvil assembly, as discussed above, or a fresh surgical buttress may be installed into the surgical buttress applicator, as also discussed above.

Further, the surgical buttress loading assembly can be sized and shaped to correspond to a particular jaw onto which it is to be assembled. For example, a first surgical buttress loading assembly may have a shape corresponding to the shape of the anvil assembly and a second surgical buttress loading assembly may have a shape corresponding to the staple cartridge assembly. As shown in FIG. 1 , the anvil assembly 40 has a lower profile and is more curved in shape than the staple cartridge assembly 50, which is deeper and may be rounded or more rectangular in shape. Accordingly, the surgical buttress and the surgical buttress applicator of this disclosure may be any size and/or shape to accommodate a variety of surgical stapler sizes and/or configurations.

As shown, for example, in FIGS. 11-13 , surgical buttresses, shown as anvil and cartridge buttresses 100 a, 100 b, are respectively configured for use with the anvil and staple cartridge assemblies 40, 50 of the end effector 30 of the surgical stapler 1 (FIG. 1 ) and likewise, surgical buttress applicators (not shown) are configured for use with the anvil and cartridge buttresses 100 a, 100 b. The anvil and cartridge buttresses 100 a, 100 b each include a release strap 102 a, 102 b, a folded portion 104 a, 104 b, and a buttress portion 106 a, 106 b. Perforations 108 a, 108 b are disposed between the folded portion 104 a, 104 b and the buttress portion 106 a, 106 b of the respective anvil and cartridge buttress 100 a, 100 b, and are optimized to allow for sequential detachment of the folded portion 104 a, 104 b from the buttress portion 106 a, 106 b when the release strap 102 a, 102 b is pulled. The folded portion 106 a, 106 b and the buttress portion 106 a, 106 b are formed from a single sheet of material having the perforations 108 a, 108 b formed therein, and the release strap 102 a, 102 b is attached to the respective folded portion 106 a, 106 b. Loops 107 a, 107 b are disposed at terminal ends of the respective release strap 102 a, 102 b and are configured for positioning around the inner handle housing of the respective surgical buttress applicator with which the anvil and cartridge buttresses 100 a, 100 b are utilized.

Turning now to FIGS. 14-19 , one embodiment of a surgical buttress assembly 300, in accordance with the present disclosure, can be releasably coupled to the end effector 30. The surgical buttress assembly 300 includes a buttress 310 and a release strap 320 that are selectively attachable to one another and to the anvil assembly 40.

The buttress 310 of the surgical buttress assembly 300 includes a buttress body portion 312, a first side flap 314 having an inner edge 314 i supported along a first side edge 312 a of the buttress body portion 312, a second side flap 316 having an inner edge 316 i supported along a second side edge 312 b of the buttress body portion 312, and a toe strap 318 that extends distally from the buttress body portion 312. The buttress 310 may include a longitudinal perforation 315 that extends between the buttress body portion 312 and the toe strap 318. The first side flap 314 includes a distal tab 314 a that extends laterally outward from an outer edge 314 o of the first side flap 314. The second side flap 316 includes a distal tab 316 a that extends laterally outward from an outer edge 316 o of the second side flap 316. The first and second side flaps 314, 316 define a plurality of spaced apart detent slots 311 there along. The distal tabs 314 a, 316 a extending from the first and second side flaps 314, 316, respectively, and the toe strap 318 define retention slots 313 therethrough. The buttress body portion 312 is configured to abut the anvil plate 42 (e.g., covering staple forming pockets 45; see FIG. 2A) so that flaps 314, 316, distal tabs 314 a, 314 b, and the toe strap 318 of the buttress 310 fold over the top of the anvil assembly 40 to support the buttress 310 on the anvil assembly 40. In particular, the distal tabs 314 a, 316 a, and the toe strap 318 are folded in an overlapped manner such that the retentions slots 313 of the distal tabs 314 a, 316 a, and the toe strap 318 are aligned with one another as shown in FIGS. 19 and 22-26 . The longitudinal perforation 315 is configured to enable adjacent distal portions 312 d, 312 e of buttress body portion 312 to separate, in laterally opposite directions relative a longitudinal axis “L” of buttress 310 (see FIG. 18 ), so that the distal tabs 314 a, 316 a can be approximated closer to one another for aligning retention slots 313 when distal tabs 314 a, 316 a are folded about anvil assembly 40, for example, to accommodate different anvil assembly configurations (e.g., changes in width, girth, etc.).

The release strap 320 of the surgical buttress assembly 300, similar to release strap 102, includes an elongate portion 322 that extends distally to a detent assembly 324 configured to releasably secure the buttress 310 to the anvil assembly 40 of the end effector 30. Detent assembly 324 includes a body portion 326 having plurality of detents 328 supported on opposed sides of the body portion 326.

As best illustrated in FIGS. 20 and 21 , the detents 328 of detent assembly 324 of release strap 320 include a tail 328 a having a lateral portion 328 b that tapers laterally outward from the body portion 326 to a longitudinal portion 328 c. The longitudinal portion 328 b of the tail 328 a extends distally from the lateral portion 328 b of the tail 328 a to a head 328 d of the detent 328. The head 328 d of the detent 328 includes a chin 328 e that extends laterally inward beyond a width of the longitudinal portion 328 c of the tail 328 a. The heads 328 d of detents 328 are tapered distally to facilitate insertion into detent slots 311 of buttress 310. The heads 328 d expand in the proximal direction to define the chins 328 e. Adjacent detents 328 define a channel 328 f therebetween that may have a hooked or J-shaped configuration. The detent assembly 324 of release strap 320 extends distally to a finger assembly 330 including side digits or fingers 330 a and an intermediate digit or finger 330 b disposed between the side digits or fingers 330 a and that is longer than the side digits or fingers 330 a (see FIG. 20 ).

With reference to FIGS. 22 and 23 , to attach surgical buttress assembly 300 to anvil assembly 40, the buttress 310 is secured to anvil assembly 40 by abutting buttress 310 against anvil plate 42 of anvil assembly 40 to cover staple forming pockets 45 (FIG. 2A) and folding first and second side flaps 314, 316 of buttress 310 over outwardly facing surface 46 surface 47 of anvil assembly 40. Distal tabs 314 a, 316 a are then folded over one another so that retention slots 313 thereof are aligned as seen in FIG. 22 . The toe strap 318 of buttress 310 is then folded over the distal end of anvil assembly 40 and onto outwardly facing surface 46 of anvil assembly 40 and onto the folded distal tabs 314 a, 316 a. The retention slots 313 of the toe strap 318 are then aligned with the retention slots of the folded distal tabs 314 a, 316 a. The release strap 320 is secured to the buttress 310 so that the detents 328 are received in the detent slots 311 of buttress 310 so that the chins 328 e of the detents 328 retain the detents 328 within the detent slots 311, and the side digits or fingers 330 a of the finger assembly 330 of release strap 320 are received in distal detent slots 311 d of the buttress 310.

As seen in FIG. 24 , the intermediate digit or finger 330 b is then looped through the retention slots 313 of the distal tabs 314 a, 316 a and the toe strap 318 of the buttress 310 to secure the finger assembly 330 of the release strap 320 to the buttress 310.

To separate the surgical buttress assembly 300 from the anvil assembly 40, as illustrated in FIGS. 25 and 26 , the release strap 320 is drawn proximally, as indicated by arrows “P,” to a first proximal position (FIG. 25 ) so that the detents 328 and side digits or fingers 330 a of the release strap 320 separate from the detent slots 311 of the buttress 310. The detent slots 311 may be configured to tear, stretch, fold, etc., to enable the heads 328 ad of the detents 328 to separate from the detent slots 311. Additionally, and/or alternatively, the detents 328, or portions thereof (e.g., heads 328 d and/or chins 328 e of the detents 328) may be configured to tear, stretch, fold, etc. to facilitate separation of detents 328 of release strap 320 from detent slots 311 of buttress. In the first proximal position of the release strap 320, the intermediate digit or finger 330 b of the release strap 320 is partially retained within some of the retention slots 313 (e.g., proximally positioned retention slots 313 p) of the buttress 310 so that the distal tabs 314 a, 316 b of the buttress 310 remain attached to the toe strap 318 of the buttress 310 by a distal portion of the intermediate digit or finger 330 b of the finger assembly 330 of the release strap 320. The intermediate digit or finger 330 b partially retracts through the retention slots 313, as indicated by arrows “R,” when the release strap 320 is drawn to the first proximal position.

To enable the buttress 310 to separate from the anvil assembly 40, the release strap 320 is drawn proximally from the first proximal position to a second proximal position (not explicitly shown). The second proximal position is proximal to the first proximal position and sufficiently proximal relative to the buttress 310 to draw the intermediate digit or finger 330 b of the finger assembly 330 of the release strap 320 from the proximally positioned retention slots 313 p of the buttress 310 and release strap 320 so that the toe strap 318 and the distal tabs 314 a, 316 a of the buttress 310 can unfold from the folded position or configuration (FIG. 19 ) into the unfolded position or configuration (FIG. 18 ). As the buttress 310 unfolds, the buttress 310 separates from the anvil assembly 40. Separation of the buttress 310 from the anvil assembly 40 may be effectuated, for example, after firing the end effector 30 to form fasteners 58 (e.g., staples) stored in the staple cartridge assembly 50 with the staple forming pockets 45 of anvil plate 42 of anvil assembly 40 (see FIGS. 1 and 2 ).

Turning now to FIGS. 27-33 , another embodiment of a surgical buttress assembly 400, in accordance with the present disclosure, can be releasably coupled to anvil assembly 40. The surgical buttress assembly 400 is similar to surgical buttress assembly 300, but includes a buttress 410 and a release strap 320 that are selectively attachable to one another and to the anvil assembly 40.

Illustrated in FIG. 30 is the buttress 410 in an unfolded position or configuration. Buttress 410 includes a buttress body portion 412, a first side flap 414, a second side flap 416, and a toe strap 418. The first and second side flaps 414, 416 extend laterally from opposite sides of buttress body portion 412 and define detent slots 411 therein at spaced-apart locations there along. A distal detent slot 411 d is defined through each of the respective first and second side flaps 414, 416. The toe strap 418 includes a connector 418 a that extends distally from buttress body portion 412 to a pair of wings 418 b, 418 c supported on a distal end portion of connector 418 a. The pair of wings includes a first wing 418 b and a second wing 418 c. The first and second wings 418 b, 418 c extend laterally from the connector 418 a in opposite directions from the longitudinal axis “L” of the buttress 410. Each of the first and second wings 418 b, 418 c defines a pair of retention slots 413. The first wing 418 b includes a tab 420 a that extends distally and laterally outward from the first wing 418 b. The second wing 418 c includes a tab 420 b that extends distally and laterally outward from the second wing 418 c. A detent slot 411 is defined through each of the tabs 420 a, 420 b of the respective first and second wings 418 b, 418 c.

With reference to FIGS. 31-33 , to secure the buttress 410 to anvil assembly 40, first and second flaps 414, 416 are folded upwardly, as indicated by arrows “U” and the first and second wings 418 b, 418 c of the toe strap 418 are folded over one another, as indicated by arrows “F1” and “F2,” so that buttress 410 is in a folded position or configuration (FIG. 33 ) about anvil assembly 40 (FIG. 29 ). In the folded position or configuration, the retention slots 413 of the first and second wings 418 b, 418 c are aligned with one another, detent slots 411 of tabs 420 a, 420 b are aligned with distal detent slots 411 d of first and second side flaps 414, 416 of buttress 410. In this folded position or configuration, the release strap 320 can be secured to the buttress 410 similar to the attachment of release strap 320 to buttress 310 described above. In particular, the detents 328 of release strap 320 are received in detent slots 411 and side digits 330 a of release strap 320 are received in detent slots 411 of tabs 420 a, 420 b of toe strap 418 and distal detent slots 411 d of the first and second side flaps 414, 416 of buttress 410. Release of surgical buttress assembly 400 is similar to the release of surgical buttress assembly 300 described above where release strap 320 is drawn proximally relative to buttress 410 so that the buttress 410 can unfold from anvil assembly 40.

With reference to FIGS. 35-38 , another embodiment of a surgical buttress assembly 500 can be releasably coupled to anvil assembly 40. The surgical buttress assembly 500 is similar to surgical buttress assembly 300, but includes a buttress 510 and a release strap 520 that are selectively attachable to one another and to the anvil assembly 40. The buttress 510 of surgical buttress assembly 500 is similar to buttress 310 of surgical buttress assembly 300, but without the distal tabs extending from side flaps 514, 516 thereof and including a toe strap 518. Toe strap 518 defines retention slots 513 therethrough. The release strap 520 of surgical buttress assembly 500 is similar to release strap 320 of surgical buttress assembly 300, but includes an intermediate digit 530 b including a distal tongue 532 having a gradually thickened width.

As illustrated in FIG. 39 , to separate buttress 510 from the anvil assembly 40, release strap 520 is drawn proximally, as indicated by arrows “P.” With distal tongue 532 of intermediate digit 530 b being wider than retention slot 511, the buttress 510 does not separate from anvil 40 until the release strap 520, by virtue of the tensile force applied to toe strap 518 through the distal tongue 532, tears toe strap 518, or a portion thereof, away from buttress 510, as illustrated by tear “T.” In some embodiments, toe strap 518 may be perforated to facilitate tearing.

Illustrated in FIGS. 40-42 is another embodiment of a surgical buttress assembly 600 secured to the anvil assembly 40. Surgical buttress assembly 600 includes a buttress 610 and a release strap 620. Buttress 610, which is similar to the other disclosed buttresses, but does not include any retention slots. Rather, buttress 610 includes a buttress body portion 612 having first and second side flaps 614, 616 and a plurality of wings 618 a, 618 b, 618 c that are connected to a distal end portion of buttress body portion 612 by a connector 620. The first and second side flaps 614, 616 define detent slots 611 therethrough. The plurality of wings 618 a, 618 b, 618 c fold over one another and can be secured together by any suitable securement technique such as welding, fastening, suturing, adhesion, etc. When folded over one another, the plurality of wings 618 a, 618 b, 618 c define a cupped configuration 622 that mounts over a distal end portion of the anvil assembly 40 as seen in FIG. 41 . Release strap 620 is similar to release strap 320, but does not include a finger assembly 330. Also similar to the disclosed surgical buttress assemblies, surgical buttress assembly 600 is released by proximally retracting release strap 620 relative to buttress 610, as indicated by arrow “P,” so that detents 628 of release strap 620 are separated from the detent slots 611 of buttress 620. Once end effector 30 is fired so that the formed staples 58 secure the buttress 620 to tissue, a proximal retraction of anvil assembly 40 relative to buttress 610 will enable the cup configuration 622 of buttress 610, and buttress 610 as a whole, to separate from anvil assembly 40.

The surgical buttresses of this disclosure may be fabricated from biocompatible materials which are bioabsorbable or non-absorbable, natural or synthetic materials. It should be understood that any combination of natural, synthetic, bioabsorbable, and/or non-bioabsorbable materials may be used to form the surgical buttresses. The surgical buttresses may be biodegradable (e.g., formed from bioabsorbable and bioresorable materials) such that the surgical buttresses decompose or are broken down (physically or chemically) under physiological conditions in the body, and the degradation products are excretable or absorbable by the body. Components or portions of the surgical buttresses may be formed from the same material or different materials.

In embodiments, at least a portion of the surgical buttresses are made from biodegradable materials selected from the following group: natural collagenous materials, cat gut, and synthetic resins including those derived from alkylene carbonates, trimethylene carbonate, tetramethylene carbonate, caprolactone, valerolactone, dioxanone, polyanhydrides, polyesters, polyacrylates, polymethylmethacrylates, polyurethanes, glycolic acid, lactic acid, glycolide, lactide, polyhydroxy butyrates, polyorthoester, polyhydroxy alkanoates, homopolymers thereof, and copolymers thereof. In embodiments, at least a portion of the surgical buttresses may be made from non-biodegradable materials selected from the following group: polyolefins, polyethylene, polydimethylsiloxane, polypropylene, copolymers of polyethylene and polypropylene, blends of polyethylene and polypropylene, ultra high molecular weight polyethylene, polyamides, polyesters, polyethylene terephthalate, polytetrafluoroethylene, polyether-esters, polybutester, polytetramethylene ether glycol, 1,4-butanediol, and polyurethanes.

The surgical buttresses may be porous, non-porous, or combinations thereof. Suitable porous structures include, for example, fibrous structures (e.g., knitted structures, woven structures, and non-woven structures) and/or foams (e.g., open or closed cell foams). Suitable non-porous structures include, for example, films. The surgical buttresses, or portions thereof, may be a non-woven structure formed by melt-blown or melt-spun methods, a mesh material, a braid material, and/or a molded or extruded sheet. The surgical buttresses, or portions thereof, may be a single porous or non-porous layer, or include a plurality of layers including any combination of porous and/or non-porous layers.

The surgical buttresses may be provided and/or sold as part of the surgical buttress loading assembly that includes one or more of the surgical buttresses and the surgical buttress applicator. Alternatively, the surgical buttress(es) and the surgical buttress applicator may be provided and/or sold separately and assembled by the user. In embodiments, one or more surgical buttresses and one or more surgical buttress applicators are provided in a kit. In some embodiments, the kit further includes one or more end effectors (and/or surgical loading units) and, in certain embodiments, the kit further includes a surgical stapler.

In any of the embodiments disclosed herein, the surgical buttresses can include, or be used with, brachytherapy, chemotherapy, other medical materials or pharmaceuticals. The buttress portion of the surgical buttress can have pockets, apertures, or other features for retaining brachytherapy seeds with the buttress portion, or brachytherapy seeds or materials can be incorporated into a suture or sutures that are threaded into or through the buttress portion or otherwise attached thereto. A coating having brachytherapy materials can be applied to a buttress portion of a surgical buttress by spraying or dipping. Chemotherapy pharmaceuticals or agents can be incorporated into the buttress portion of the surgical buttress, coated thereon, or applied as part of a suture or suture or other feature.

While several embodiments of the disclosure have been shown in the drawings, it is not intended that the disclosure be limited thereto, as it is intended that the disclosure be as broad in scope as the art will allow and that the specification be read likewise. It is to be understood, therefore, that this disclosure is not limited to the precise embodiments described, and that various other changes and modifications may be effected by one skilled in the art without departing from the scope or spirit of the disclosure. Additionally, the elements and features shown and described in connection with certain embodiments may be combined with the elements and features of certain other embodiments without departing from the scope of this disclosure, and that such modifications and variation are also included within the scope of this disclosure. Therefore, the above description should not be construed as limiting, but merely as exemplifications of preferred embodiments. Thus the scope of the embodiments should be determined by the appended claims and their legal equivalents, rather than by the examples given. 

What is claimed is:
 1. A surgical buttress assembly for a surgical stapling apparatus, the surgical buttress assembly comprising: a buttress comprising a buttress body portion supporting a toe strap that extends distally from the buttress body portion; and a release strap that is releasably coupled to the toe strap of the buttress, the release strap being movable relative to the buttress to separate the release strap from the buttress.
 2. The surgical buttress assembly of claim 1, wherein the release strap includes detents configured to couple to the buttress to secure the release strap to the buttress.
 3. The surgical buttress assembly of claim 2, wherein the buttress defines detent slots that are configured to receive the detents of the release strap.
 4. The surgical buttress assembly of claim 3, wherein the buttress body includes a first side flap on a first side of the buttress body portion and a second side flap on a second side of the buttress body portion, the first and second flaps configured to fold over an anvil assembly of the surgical stapling apparatus to support the buttress body on the anvil assembly.
 5. The surgical buttress assembly of claim 4, wherein the first and second side flaps define the detents slots, the detent slots positioned in longitudinally spaced-apart locations along the first and second side flaps.
 6. The surgical buttress assembly of claim 5, wherein the release strap includes a finger assembly that extends distally from the release strap, the finger assembly configured to couple to the toe strap.
 7. The surgical buttress assembly of claim 6, wherein the finger assembly includes a first digit and a second digit, the first digit receivable within one of the detent slots of the buttress, the second digit configured to be secured to the toe strap.
 8. The surgical buttress assembly of claim 7, wherein the first and second side flaps include distal tabs that define retention slots and the toe strap defines retention slots that are positioned to align with the retention slots of the distal tabs when the distal tabs and the toe strap are folded together over the anvil assembly.
 9. The surgical buttress assembly of claim 8, wherein the second digit of the finger assembly is looped through the retentions slots of the distal tabs and the toe strap to secure the release strap to the buttress.
 10. The surgical buttress assembly of claim 7, wherein the second digit includes a distal tongue having a gradually thickened width.
 11. The surgical buttress assembly of claim 1, wherein the toe strap of the buttress includes a plurality of wings.
 12. An end effector for a surgical stapling apparatus, the end effector comprising: a cartridge assembly; and an anvil movably coupled to the cartridge assembly and supporting a surgical buttress assembly, the surgical buttress assembly including: a buttress comprising a buttress body portion supporting a toe strap that extends distally from the buttress body portion; and a release strap that is releasably coupled to the toe strap of the buttress, the release strap being movable relative to the buttress to separate the release strap from the buttress.
 13. The end effector of claim 12, wherein the release strap includes detents configured to couple to the buttress to secure the release strap to the buttress.
 14. The end effector of claim 13, wherein the buttress defines detent slots that are configured to receive the detents of the release strap.
 15. The end effector of claim 14, wherein the buttress body includes a first side flap on a first side of the buttress body portion and a second side flap on a second side of the buttress body portion, the first and second flaps configured to fold over an anvil assembly of the surgical stapling apparatus to support the buttress body on the anvil assembly.
 16. The end effector of claim 15, wherein the first and second side flaps define the detents slots, the detent slots positioned in longitudinally spaced-apart locations along the first and second side flaps.
 17. The end effector of claim 14, wherein the release strap includes a finger assembly that extends distally from the release strap, the finger assembly configured to couple to the toe strap.
 18. The end effector of claim 15, wherein the finger assembly includes a first digit and a second digit, the first digit receivable within one of the detent slots of the buttress, the second digit configured to be secured to the toe strap.
 19. The end effector of claim 16, wherein the first and second side flaps includes distal tabs that define retention slots and the toe strap defines retention slots that are positioned to align with the retention slots of the distal tabs when the distal tabs and the toe strap are folded together over the anvil assembly.
 20. The end effector of claim 19, wherein the second digit of the finger assembly is looped through the retentions slots of the distal tabs and the toe strap to secure the release strap to the buttress. 